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We have a cm921 thermostat which works but the screen is so faded you can't see anything

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Try new batteries in the thermostat

Posted on Mar 29, 2014

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1 Answer

Why is screen very dark and difficult to read?


LCD screens tend to fade with age. I keep a small LED torch on top of the thermostat just for reading the screen. It is especially useful when resetting the thermostat.

Apr 22, 2016 | Heating & Cooling

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Honeywell cm921 has only half the numbers displayed.


a new thermostat is needed. Someone probably banged it. replacing it will be easier and cheaper for you

Oct 22, 2013 | Heating & Cooling

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Replace the thermostat.

Oct 22, 2013 | Heating & Cooling

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CM921 LCD figures breaking up


Hi There - I have a similar problem to the one described by yourself . Did anyone offer any help or assistance on this at all ?
Many thanks
M Hudson

Jul 15, 2013 | Honeywell Programmable Thermostat Heater

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Honeywell thermostat CM921, how to set the heating for a 6.30am??


if you have a programable tstat you need to go through the settings for each day and time. usually the buttton will say prgm or program sometimes it will be set try to get into the settings menue and then you can adjust times

Sep 02, 2009 | Honeywell Programmable Thermostat Heater

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